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Publication numberUS6465979 B1
Publication typeGrant
Application numberUS 09/355,852
PCT numberPCT/SE1998/000162
Publication dateOct 15, 2002
Filing dateFeb 2, 1998
Priority dateFeb 3, 1997
Fee statusLapsed
Also published asCA2278631A1, CN1104767C, CN1246972A, EP1012945A1, WO1998034315A1
Publication number09355852, 355852, PCT/1998/162, PCT/SE/1998/000162, PCT/SE/1998/00162, PCT/SE/98/000162, PCT/SE/98/00162, PCT/SE1998/000162, PCT/SE1998/00162, PCT/SE1998000162, PCT/SE199800162, PCT/SE98/000162, PCT/SE98/00162, PCT/SE98000162, PCT/SE9800162, US 6465979 B1, US 6465979B1, US-B1-6465979, US6465979 B1, US6465979B1
InventorsMats Leijon, Lars Gertmar, Jan-Anders Nygren, Peter Templin
Original AssigneeAbb Ab
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Series compensation of electric alternating current machines
US 6465979 B1
Abstract
A method and device for providing series compensation for rotating electric alternating current machines connected either directly, or via a static current converter, to a three-phase distribution or transmission network. The stator of the electric machine is Y-connected. A capacitive circuit for the fundamental frequency of the voltage is connected to each phase between the low voltage side of the winding and a ground of the transmission network.
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Claims(16)
What is claimed is:
1. A method for providing series compensation of a rotating electric alternating current machine connected to a three-phase network for at least one of distribution and transmission, the three-phase network having a fundamental frequency, the rotating electric alternating current machine being one of directly connected to the three-phase network and connected via a static current converter, a stator winding of the rotating electric alternating current machine having three phases Y-connected, comprising the steps of:
connecting a down side of a first phase of the three phases of the stator winding to a first side of a first capacitive circuit;
connecting a second side of the first capacitive circuit to a ground of the three-phase network completing a first series capacitive circuit;
connecting a down side of a second phase of the three phases of the stator winding to a first side of a second capacitive circuit;
connecting a second side of the second capacitive circuit to the ground of the three-phase network completing a second series capacitive circuit;
connecting a down side of a third phase of the three phases of the stator winding to a first side of a third capacitive circuit;
connecting a second side of the third capacitive circuit to the ground of the three-phase network completing a third series capacitive circuit; and
lowering a reactance of a system including the rotating electric alternating current machine by compensating the three phases of the stator winding through respective series capacitive circuits.
2. A device for providing series compensation of a rotating electric alternating current machine connected to a three-phase network for at least one of distribution and transmission, the three-phase network having a fundamental frequency, the rotating electric alternating current machine being one of directly connected to the three-phase network and connected via a static current converter, a stator winding of the rotating electric alternating current machine having three phases Y-connected, comprising:
a first capacitive circuit having a first side and a second side, the first side connected to a down side of a first phase of the three phases of the stator winding and the second side connected to a ground of the three-phase network so as to create a first series capacitive circuit;
a second capacitive circuit having a first side and a second side, the first side connected to a down side of a second phase of the three phases of the stator winding and the second side connected to the ground of the three-phase network so as to create a second series capacitive circuit; and
a third capacitive circuit having a first side and a second side, the first side connected to a down side of a third phase of the three phases of the stator winding and the second side connected to the ground of the three-phase network so as to create a third series capacitive circuit, wherein
the first series capacitive circuit, the second series capacitive circuit, and the third series capacitive circuit are configured to lower a reactance of a system including the rotating electric alternating current machine by compensating the three phases of the stator winding through respective series capacitive circuits.
3. The device of claim 2, wherein:
the first series capacitive circuit includes a first capacitor;
the second series capacitive circuit includes a second capacitor; and
the third series capacitive circuit includes a third capacitor.
4. The device of claim 3, further comprising:
means for protecting from over-voltage connected in parallel with the first capacitor;
means for protecting from over-voltage connected in parallel with the second capacitor; and
means for protecting from over-voltage connected in parallel with the third capacitor.
5. The device of claim 2, further comprising:
a bandstop filter connected in series between a Y-point and the ground of the three-phase network, the Y-point including the second side of the first capacitive circuit, the second side of the second capacitive circuit and the second side of the third capacitive circuit.
6. The device of claim 5, further comprising a low-ohmic resistor connected in series between the bandstop filter and the ground of the three-phase network.
7. A rotating electric alternating current machine, comprising:
a stator having slots;
a stator winding drawn through the slots of the stator, the stator winding being a high-voltage cable; and
a series compensation device having
a first capacitive circuit having a first side and a second side, the first side connected to a down side of a first phase of three phases of the stator winding and the second side connected to a ground of a three-phase network so as to create a first series capacitive circuit;
a second capacitive circuit having a first side and a second side, the first side connected to a down side of a second phase of the three phases of the stator winding and the second side connected to the ground of the three-phase network so as to create a second series capacitive circuit; and
a third capacitive circuit having a first side and a second side, the first side connected to a down side of a third phase of the three phases of the stator winding and the second side connected to the ground of the three-phase network so as to create a third series capacitive circuit, wherein
the three-phase network is for at least one of distribution and transmission, the three-phase network has a fundamental frequency, and
the first series capacitive circuit, the second series capacitive circuit, and the third series capacitive circuit are configured to lower a reactance of a system including the rotating electric alternating current machine by compensating the three phases of the stator winding through respective series capacitive circuits.
8. The rotating electric alternating current machine of claim 7, wherein the stator winding comprise s a high-voltage cable having,
a core having a plurality of conductive strands,
an inner semiconducting layer surrounding the core,
an insulating layer surrounding the inner semiconducting layer, and
an outer semiconducting layer surrounding the insulating layer.
9. The rotating electric alternating current machine of claim 8, wherein the high-voltage cable has a diameter in an inclusive range of 20 through 200 mm, and a conducting area in an inclusive range of 80 through 3000 mm2.
10. The rotating electric alternating current machine of claim 8, wherein:
the high-voltage cable is flexible,
the inner semiconducting layer is in contact with the core,
the insulating layer is in contact with the inner semiconducting layer, and
the outer semiconducting layer is in contact with the insulating layer.
11. The rotating electric alternating current machine of claim 8, wherein:
the inner semiconducting layer, the insulating layer, and the outer semiconducting layer are configured to have an elasticity and coefficients of thermal expansion such that a change in a volume of the layers caused by a change in temperature is absorbed such that the inner semiconducting layer maintains contact with the core, the insulating layer maintains contact with the inner semiconducting layer, and the outer semiconducting layer maintains contact with the insulating layer.
12. The rotating electric alternating current machine of claim 8, wherein:
the inner semiconducting layer, the insulating layer, and the outer semiconducting layer are configured to have a modulus of elasticity less than 500 MPa.
13. The rotating electric alternating current machine of claim 8, wherein:
the inner semiconducting layer, the insulating layer, and the outer semiconducting layer are configured to have substantially the same coefficient of thermal expansion.
14. The rotating electric alternating current machine of claim 8, wherein:
an adhesion between the layers being at least as strong as a strength of a weakest material in the layers.
15. The rotating electric alternating current machine of claim 8, wherein:
the inner semiconducting layer comprises an equipotential surface, and
the outer semiconductor layer comprises an equipotential surface.
16. The rotating electric alternating current machine of claim 8, wherein:
the inner semiconducting layer, the insulating layer, and the outer semiconducting layer are configured to have a modulus of elasticity less than 200 MPa.
Description
BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a method and a device for series compensating a rotating electric alternating current machine connected, directly or via a static current converter, to a three-phase distribution or transmission network, wherein the stator winding of the alternating current machine is Y-connected. The invention also relates to a rotating electric machine provided with such a series compensation device.

The invention refers primarily to electric alternating current machines intended for use as generators in power stations for generating electric power. A typical operating range may be 36 to 800 kV, so that they can be connected directly to all types of high-voltage power networks. This is possible thanks to the use of high-voltage insulated electric conductors with solid insulation similar to cables for transmitting electric power, in the following termed high-voltage cable. The cable is also provided with an outer semiconducting layer with the help of which its potential in relation to the surroundings is defined.

2. Discussion of the Background

A conductor is known through U.S Pat. No. 5,036,165, in which the insulation is provided with an inner and an outer layer of semiconducting pyrolized glassfiber. It is also known to provide conductors in a dynamo-electric machine with such an insulation, as described in U.S Pat. No. 5,066,881 for instance, where a semiconducting pyrolized glassfiber layer is in contact with the two parallel rods forming the conductor, and the insulation in the stator slots is surrounded by an outer layer of semiconducting pyrolized glassfiber. The pyrolized glassfiber material is described as suitable since it retains its resistivity even after the impregnation treatment.

Series compensation on both high voltage transmission networks and distribution networks is already known.

Series compensation on both high voltage transmission networks and distribution networks is already known. It is also well known that geomagnetically induced currents can cause harmful heating in directly grounded power network system

From U.S Pat. No. A1, 4,341,989 a device is also previously known for phase compensation of a multiphase rotating electric alternating current machine by connecting in series or in parallel with each phase winding a capacitive element on the upside of the winding.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a new method and a new device for lowering the system reactance through series compensation of the alternating current machine in question as well as for preventing geomagnetically induced currents.

This object is achieved with a method and a device of the type described in the introduction, having the features defined herein.

According to the invention, thus, the compensation is performed on the down side of the windings, so that low-voltage insulated capacitors can be used, which is not possible with series compensation in high-voltage transmission networks according to known technology. Less expensive capacitors can therefore be used in the device according to the invention, since they are protected by the machine itself and connected to the neutral point, which is at low potential in relation to earth. This solution is especially advantageous for the type of machines to which the present invention relates, since their upside is intended to be connected directly to high-voltage power networks.

According to an advantageous embodiment of the device according to invention, an over-voltage protection means is connected in parallel with the capacitors so that they are protected from any over-voltages that may appear in the event of a fault condition.

According to a second advantageous embodiment of the device according to the invention, a bandstop filter is arranged between the Y-point of the capacitor bank formed by the capacitors and the earth point of the distribution or transmission network, possibly with a low-ohmic resistor connected between the bandstop filter and the earth point. This resistor may be a neutral-point resistor, dimensioned for a harmless earth-fault current of a few tens of amperes. An earth fault in the alternating current machine or the generator is able to emit an earth-fault current via this resistor but, by controlling the earth-fault current, measures can be taken to disconnect the generator or possibly the faulty phase.

From a power network point of view any increase in transient machine reactance can also be efficiently compensated in this manner.

In the machine according to the invention the windings are preferably composed of cables having solid, extruded insulation, of a type now used for power distribution, such as XLPE-cables or cables with EPR-insulation. Such cables are flexible, which is an important property in this context since the technology for the machine according to the invention is based primarily on winding systems in which the winding is formed from cable which is bent during assembly. The flexibility of a XLPE-cable normally corresponds to a radius of curvature of approximately 20 cm for a cable 30 mm in diameter, and a radius of curvature of approximately 65 cm for a cable 80 mm in diameter. In the present application the term “flexible” is used to indicate that the winding is flexible down to a radius of curvature of the order of four times the cable diameter, preferably eight to twelve times the cable diameter.

Windings in the present invention are constructed to retain their properties even when they are bent and when they are subjected to thermal stress during operation. It is vital that the layers retain their adhesion to each other in this context. The material properties of the layers are decisive here, particularly their elasticity and relative coefficients of thermal expansion. In a XLPE-cable, for instance, the insulating layer consists of cross-linked, lowdensity polyethylene, and the semiconducting layers consist of polyethylene with soot and metal particles mixed in. Changes in volume as a result of temperature fluctuations are completely absorbed as changes in radius in the cable and, thanks to the comparatively slight difference between the coefficients of thermal expansion in the layers in relation to the elasticity of these materials, the radial expansion can take place without the adhesion between the layers being lost.

The material combinations stated above should be considered only as examples. Other combinations fulfilling the conditions specified and also the condition of being semiconducting, i.e. having resistivity within the range of 10−1-106 ohm-cm, e.g. 1-500 ohm-cm, or 10-200 ohm-cm, naturally also fall within the scope of the invention.

The insulating layer may consist, for example, of a solid thermoplastic material such as low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), polybutylene (PB), polymethyl pentene (PMP), cross-linked materials such as cross-linked polyethylene (XLPE), or rubber such as ethylene propylene rubber (EPR) or silicon rubber.

The inner and outer semiconducting layers may be of the same basic material but with particles of conducting material such as soot or metal powder mixed in.

The mechanical properties of these materials, particularly their coefficients of. thermal expansion, are affected relatively little by whether soot or metal powder is mixed in or not—at least in the proportions required to achieve the conductivity necessary according to the invention. The insulating layer and the semiconducting layers thus have substantially the same coefficients of thermal expansion.

Ethylene-vinyl-acetate copolymers/nitrile rubber, butyl graft polyethylene, ethylene-butyl-acrylate-copolymers and ethylene-ethyl-acrylate copolymers may also constitute suitable polymers for the semiconducting layers.

Even when different types of material are used as base in the various layers, it is desirable for their coefficients of thermal expansion to be substantially the same. This is the case with combination of the materials listed above.

The materials listed above have relatively good elasticity, with an E-modulus of E<500 MPa, preferably <200 MPa. The elasticity is sufficient for any minor differences between the coefficients of thermal expansion for the materials in the layers to be absorbed in the radial direction of the elasticity so that no cracks or other damage appear and so that the layers are not released from each other. The material in the layers is elastic, and the adhesion between the layers is at least of the same magnitude as the weakest of the materials.

The conductivity of the two semiconducting layers is sufficient to substantially equalize the potential along each layer. The conductivity of the outer semiconducting layer is sufficiently large to contain the electrical field in the cable, but sufficiently small not to give rise to significant losses due to currents induced in the longitudinal direction of the layer.

Thus, each of the two semiconducting layers essentially constitutes one equipotential surface, and these layers will substantially enclose the electrical field between them.

There is, of course, nothing to prevent one or more additional semiconducting layers being arranged in the insulating layer.

BRIEF DESCRIPTION OF THE DRAWINGS

A more complete appreciation of the present invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:

FIG. 1 is a schematic diagram of one embodiment of the present invention; and

FIG. 2 is a cross section of a high-voltage cable used as a winding in a rotating machine according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows an alternating current machine 2 in the form of a generator, the phase voltages of which are connectedly directly to the network 6 via isolators and breakers 4. Over-voltage protection means 8 and current measuring devices 10 are also provided on the output side of the generator 2.

The stator winding of the generator 2 is Y-connected and a series-compensation capacitor 14 is connected in each of the phases on the down side of the winding. A bandstop filter 16 is connected to the Y-point of the capacitor bank and a neutral-point resistor 18 is connected to the earth point 20 of the network 6. Current measuring devices 22, 24 are also provided on this side of the generator 2.

Connecting a series capacitor 14 in each of the phases achieves series compensation of the alternating current machine 2, thereby lowering the system reactance.

Over-voltage protection means 26 and a resistance R are suitably provided in order to protect the capacitors 14 in the event of a fault condition.

The filter 16 has nothing directly to do with the invention and will not be described in more detail.

The neutral-point resistor 18 is dimensioned to limit earth faults to a harmless magnitude of a few tens of amperes. An earth fault in the generator 2 may thus result in an earth-fault current through the resistor 18, and controlling the magnitude of this current enables measures to be taken for disconnecting the generator and possibly the faulty phase.

Alternatively the generator 2 may be connected to the network via a converter 28, as indicated in FIG. 1.

The field excitation of the generator has been omitted in FIG. 1.

FIG. 2 shows a cross section through a high-voltage cable 29 used in the rotating electric machine according to the invention. The high-voltage cable 29 is composed of a number of strand parts 31 made of copper, for instance, and having circular cross section. These strand parts 31 are arranged in the middle of the high-voltage cable 29. Around the strand parts 31 is a first semiconducting layer 32. Around the first semiconducting layer 32 is an insulating layer 33, e.g. XLPE-insulation, and around the insulating layer 33 is a second semiconducting layer 34.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US681800Jun 18, 1901Sep 3, 1901Oskar LascheStationary armature and inductor.
US847008Jun 10, 1904Mar 12, 1907Isidor KitseeConverter.
US1304451Jan 29, 1917May 20, 1919 Locke h
US1418856May 2, 1919Jun 6, 1922Allischalmers Mfg CompanyDynamo-electric machine
US1481585Sep 16, 1919Jan 22, 1924Electrical Improvements LtdElectric reactive winding
US1508456Jan 4, 1924Sep 16, 1924Perfection Mfg CoGround clamp
US1728915May 5, 1928Sep 24, 1929Earl P BlankenshipLine saver and restrainer for drilling cables
US1742985May 20, 1929Jan 7, 1930Gen ElectricTransformer
US1747507May 10, 1929Feb 18, 1930Westinghouse Electric & Mfg CoReactor structure
US1756672Oct 12, 1922Apr 29, 1930Allis Louis CoDynamo-electric machine
US1762775Sep 19, 1928Jun 10, 1930Bell Telephone Labor IncInductance device
US1781308May 29, 1929Nov 11, 1930Ericsson Telefon Ab L MHigh-frequency differential transformer
US1861182Jan 31, 1930May 31, 1932Okonite CoElectric conductor
US1904885Jun 13, 1930Apr 18, 1933Western Electric CoCapstan
US1974406Dec 13, 1930Sep 25, 1934Herbert F AppleDynamo electric machine core slot lining
US1976581 *Dec 21, 1932Oct 9, 1934Westinghouse Electric & Mfg CoElectrical distribution system
US2006170Apr 30, 1934Jun 25, 1935Gen ElectricWinding for the stationary members of alternating current dynamo-electric machines
US2008515 *Jul 30, 1931Jul 16, 1935Gen ElectricElectric system
US2206856May 31, 1938Jul 2, 1940William E ShearerTransformer
US2212963 *Apr 15, 1938Aug 27, 1940Wahlquist Hugo WCommunication and power system
US2217430Feb 26, 1938Oct 8, 1940Westinghouse Electric & Mfg CoWater-cooled stator for dynamoelectric machines
US2241832May 7, 1940May 13, 1941Hugo W WahlquistMethod and apparatus for reducing harmonics in power systems
US2251291Aug 10, 1940Aug 5, 1941Western Electric CoStrand handling apparatus
US2256897Jul 24, 1940Sep 23, 1941Cons Edison Co New York IncInsulating joint for electric cable sheaths and method of making same
US2295415Aug 2, 1940Sep 8, 1942Westinghouse Electric & Mfg CoAir-cooled, air-insulated transformer
US2409893Apr 30, 1945Oct 22, 1946Westinghouse Electric CorpSemiconducting composition
US2415652Jun 3, 1942Feb 11, 1947Kerite CompanyHigh-voltage cable
US2424443Dec 6, 1944Jul 22, 1947Gen ElectricDynamoelectric machine
US2436306Jun 16, 1945Feb 17, 1948Westinghouse Electric CorpCorona elimination in generator end windings
US2446999Nov 7, 1945Aug 17, 1948Gen ElectricMagnetic core
US2459322Mar 16, 1945Jan 18, 1949Allis Chalmers Mfg CoStationary induction apparatus
US2462651Jun 12, 1944Feb 22, 1949Gen ElectricElectric induction apparatus
US2498238Apr 30, 1947Feb 21, 1950Westinghouse Electric CorpResistance compositions and products thereof
US2650350Nov 4, 1948Aug 25, 1953Gen ElectricAngular modulating system
US2721905Jan 19, 1951Oct 25, 1955Webster Electric Co IncTransducer
US2749456Jun 23, 1952Jun 5, 1956Us Electrical Motors IncWaterproof stator construction for submersible dynamo-electric machine
US2780771Apr 21, 1953Feb 5, 1957Vickers IncMagnetic amplifier
US2846599Jan 23, 1956Aug 5, 1958Wetomore HodgesElectric motor components and the like and method for making the same
US2885581Apr 29, 1957May 5, 1959Gen ElectricArrangement for preventing displacement of stator end turns
US2943242Feb 5, 1958Jun 28, 1960Pure Oil CoAnti-static grounding device
US2947957Apr 22, 1957Aug 2, 1960Zenith Radio CorpTransformers
US2959699Jan 2, 1958Nov 8, 1960Gen ElectricReinforcement for random wound end turns
US2962679Jul 25, 1955Nov 29, 1960Gen ElectricCoaxial core inductive structures
US2975309May 5, 1959Mar 14, 1961Komplex Nagyberendezesek ExporOil-cooled stators for turboalternators
US3014139Oct 27, 1959Dec 19, 1961Gen ElectricDirect-cooled cable winding for electro magnetic device
US3098893Mar 30, 1961Jul 23, 1963Gen ElectricLow electrical resistance composition and cable made therefrom
US3130335Apr 17, 1961Apr 21, 1964Epoxylite CorpDynamo-electric machine
US3143269Jul 26, 1963Aug 4, 1964Crompton & Knowles CorpTractor-type stock feed
US3157806Nov 3, 1960Nov 17, 1964Bbc Brown Boveri & CieSynchronous machine with salient poles
US3158770Dec 14, 1960Nov 24, 1964Gen ElectricArmature bar vibration damping arrangement
US3197723Apr 26, 1961Jul 27, 1965Ite Circuit Breaker LtdCascaded coaxial cable transformer
US3268766Feb 4, 1964Aug 23, 1966Du PontApparatus for removal of electric charges from dielectric film surfaces
US3304599Mar 30, 1965Feb 21, 1967Teletype CorpMethod of manufacturing an electromagnet having a u-shaped core
US3354331Sep 26, 1966Nov 21, 1967Gen ElectricHigh voltage grading for dynamoelectric machine
US3365657Mar 4, 1966Jan 23, 1968Nasa UsaPower supply
US3372283Feb 15, 1965Mar 5, 1968AmpexAttenuation control device
US3392779Oct 3, 1966Jul 16, 1968Certain Teed Prod CorpGlass fiber cooling means
US3411027Jul 8, 1965Nov 12, 1968Siemens AgPermanent magnet excited electric machine
US3418530Sep 7, 1966Dec 24, 1968Army UsaElectronic crowbar
US3435262Jun 6, 1967Mar 25, 1969English Electric Co LtdCooling arrangement for stator end plates and eddy current shields of alternating current generators
US3437858Nov 17, 1966Apr 8, 1969Glastic CorpSlot wedge for electric motors or generators
US3444407Jul 20, 1966May 13, 1969Gen ElectricRigid conductor bars in dynamoelectric machine slots
US3447002Feb 28, 1966May 27, 1969Asea AbRotating electrical machine with liquid-cooled laminated stator core
US3484690Aug 23, 1966Dec 16, 1969Herman WaldThree current winding single stator network meter for 3-wire 120/208 volt service
US3541221Dec 10, 1968Nov 17, 1970Comp Generale ElectriciteElectric cable whose length does not vary as a function of temperature
US3560777Aug 12, 1969Feb 2, 1971Oerlikon MaschfElectric motor coil bandage
US3571690Oct 25, 1968Mar 23, 1971Voldemar Voldemarovich ApsitPower generating unit for railway coaches
US3593123Mar 17, 1969Jul 13, 1971English Electric Co LtdDynamo electric machines including rotor winding earth fault detector
US3631519Dec 21, 1970Dec 28, 1971Gen ElectricStress graded cable termination
US3644662Jan 11, 1971Feb 22, 1972Gen ElectricStress cascade-graded cable termination
US3651244Oct 15, 1969Mar 21, 1972Gen Cable CorpPower cable with corrugated or smooth longitudinally folded metallic shielding tape
US3651402Jan 27, 1969Mar 21, 1972Honeywell IncSupervisory apparatus
US3660721Feb 1, 1971May 2, 1972Gen ElectricProtective equipment for an alternating current power distribution system
US3666876Jul 17, 1970May 30, 1972Exxon Research Engineering CoNovel compositions with controlled electrical properties
US3670192Oct 22, 1970Jun 13, 1972Asea AbRotating electrical machine with means for preventing discharge from coil ends
US3675056Jan 4, 1971Jul 4, 1972Gen ElectricHermetically sealed dynamoelectric machine
US3684821Mar 30, 1971Aug 15, 1972Sumitomo Electric IndustriesHigh voltage insulated electric cable having outer semiconductive layer
US3684906Mar 26, 1971Aug 15, 1972Gen ElectricCastable rotor having radially venting laminations
US3699238 *Feb 29, 1972Oct 17, 1972Anaconda Wire & Cable CoFlexible power cable
US3716652Apr 18, 1972Feb 13, 1973G & W Electric Speciality CoSystem for dynamically cooling a high voltage cable termination
US3716719Jun 7, 1971Feb 13, 1973Aerco CorpModulated output transformers
US3727085Sep 30, 1971Apr 10, 1973Gen Dynamics CorpElectric motor with facility for liquid cooling
US3740600Dec 12, 1971Jun 19, 1973Gen ElectricSelf-supporting coil brace
US3743867Dec 20, 1971Jul 3, 1973Massachusetts Inst TechnologyHigh voltage oil insulated and cooled armature windings
US3746954Sep 17, 1971Jul 17, 1973Sqare D CoAdjustable voltage thyristor-controlled hoist control for a dc motor
US3758699Mar 15, 1972Sep 11, 1973G & W Electric Speciality CoApparatus and method for dynamically cooling a cable termination
US3778891Oct 30, 1972Dec 18, 1973Westinghouse Electric CorpMethod of securing dynamoelectric machine coils by slot wedge and filler locking means
US3781739Mar 28, 1973Dec 25, 1973Westinghouse Electric CorpInterleaved winding for electrical inductive apparatus
US3787607May 31, 1972Jan 22, 1974Teleprompter CorpCoaxial cable splice
US3792399Aug 28, 1972Feb 12, 1974NasaBanded transformer cores
US3801843Jun 16, 1972Apr 2, 1974Gen ElectricRotating electrical machine having rotor and stator cooled by means of heat pipes
US3809933Aug 25, 1972May 7, 1974Hitachi LtdSupercooled rotor coil type electric machine
US3813764Jan 18, 1971Jun 4, 1974Res Inst Iron SteelMethod of producing laminated pancake type superconductive magnets
US3828115Jul 27, 1973Aug 6, 1974Kerite CoHigh voltage cable having high sic insulation layer between low sic insulation layers and terminal construction thereof
US3881647Apr 30, 1973May 6, 1975Lebus International IncAnti-slack line handling device
US3884154Dec 18, 1972May 20, 1975Siemens AgPropulsion arrangement equipped with a linear motor
US3891880May 18, 1973Jun 24, 1975Bbc Brown Boveri & CieHigh voltage winding with protection against glow discharge
US3902000Nov 12, 1974Aug 26, 1975Us EnergyTermination for superconducting power transmission systems
US3912957Dec 27, 1973Oct 14, 1975Gen ElectricDynamoelectric machine stator assembly with multi-barrel connection insulator
US3932779Mar 5, 1974Jan 13, 1976Allmanna Svenska Elektriska AktiebolagetTurbo-generator rotor with a rotor winding and a method of securing the rotor winding
US3932791Feb 7, 1974Jan 13, 1976Oswald Joseph VMulti-range, high-speed A.C. over-current protection means including a static switch
US3943392Nov 27, 1974Mar 9, 1976Allis-Chalmers CorporationCombination slot liner and retainer for dynamoelectric machine conductor bars
US3947278Dec 19, 1973Mar 30, 1976Universal Oil Products CompanyDuplex resistor inks
US3965408Dec 16, 1974Jun 22, 1976International Business Machines CorporationControlled ferroresonant transformer regulated power supply
US3968388Jan 8, 1975Jul 6, 1976Kraftwerk Union AktiengesellschaftElectric machines, particularly turbogenerators, having liquid cooled rotors
US3971543Apr 17, 1975Jul 27, 1976Shanahan William FTool and kit for electrical fishing
US3974314Mar 20, 1974Aug 10, 1976Micafil A.G.Electrical insulation particularly for use in winding slots of dynamo-electric machines and method for its manufacture
US3993860Aug 18, 1975Nov 23, 1976Samuel Moore And CompanyElectrical cable adapted for use on a tractor trailer
US3995785Dec 12, 1974Dec 7, 1976Essex International, Inc.Apparatus and method for forming dynamoelectric machine field windings by pushing
US4001616Feb 10, 1975Jan 4, 1977Canadian General Electric Company LimitedGrounding of outer winding insulation to cores in dynamoelectric machines
US4008367Jun 23, 1975Feb 15, 1977Siemens AktiengesellschaftPower cable with plastic insulation and an outer conducting layer
US4008409Apr 9, 1975Feb 15, 1977General Electric CompanyDynamoelectric machine core and coil assembly
US4031310Jun 13, 1975Jun 21, 1977General Cable CorporationShrinkable electrical cable core for cryogenic cable
US4037312 *Dec 12, 1974Jul 26, 1977Westinghouse Electric CorporationMethod of fabricating a mechanically stable electrical winding having cooling openings therein
US4039740Jun 18, 1975Aug 2, 1977The Furukawa Electric Co., Ltd.Cryogenic power cable
US4041431Nov 22, 1976Aug 9, 1977Ralph OgdenInput line voltage compensating transformer power regulator
US4047138May 19, 1976Sep 6, 1977General Electric CompanyPower inductor and transformer with low acoustic noise air gap
US4053820 *Jan 29, 1976Oct 11, 1977Wisconsin Alumni Research FoundationActive filter
US4064419Oct 8, 1976Dec 20, 1977Westinghouse Electric CorporationSynchronous motor KVAR regulation system
US4084307Nov 11, 1976Apr 18, 1978Allmanna Svenska Elektriska AktiebolagetMethod of joining two cables with an insulation of cross-linked polyethylene or another cross linked linear polymer
US4085347Jan 16, 1976Apr 18, 1978White-Westinghouse CorporationLaminated stator core
US4088953Nov 15, 1976May 9, 1978The Reluxtrol CompanyEddy-current test probe utilizing a combination of high and low reluctance materials to optimize probe sensitivity
US4091138Feb 4, 1976May 23, 1978Sumitomo Bakelite Company LimitedInsulating film, sheet, or plate material with metallic coating and method for manufacturing same
US4091139Sep 17, 1975May 23, 1978Westinghouse Electric Corp.Semiconductor binding tape and an electrical member wrapped therewith
US4099227Dec 1, 1976Jul 4, 1978Square D CompanySensor circuit
US4103075Oct 28, 1976Jul 25, 1978Airco, Inc.Composite monolithic low-loss superconductor for power transmission line
US4106069May 11, 1977Aug 8, 1978Siemens AktiengesellschaftProtection arrangement for a brushless synchronous machine
US4107092Mar 24, 1976Aug 15, 1978Uop Inc.Novel compositions of matter
US4109098Sep 1, 1976Aug 22, 1978Telefonaktiebolaget L M EricssonHigh voltage cable
US4121148Apr 25, 1977Oct 17, 1978Dipl.-Ing. Hitzinger & Co.Brushless synchronous generator system
US4132914Oct 15, 1976Jan 2, 1979Khutoretsky Garri MSix-phase winding of electric machine stator
US4134036Jun 3, 1977Jan 9, 1979Cooper Industries, Inc.Motor mounting device
US4134055Mar 29, 1976Jan 9, 1979Mitsubushi Denki Kabushiki KaishaInductor type synchronous motor driving system
US4134146Feb 9, 1978Jan 9, 1979General Electric CompanySurge arrester gap assembly
US4149101May 12, 1977Apr 10, 1979Lesokhin Albert ZArrangement for locking slot wedges retaining electric windings
US4152615Jun 14, 1977May 1, 1979Westinghouse Electric Corp.End iron axial flux damper system
US4160193Nov 17, 1977Jul 3, 1979Richmond Abraham WMetal vapor electric discharge lamp system
US4164672Aug 18, 1977Aug 14, 1979Electric Power Research Institute, Inc.Cooling and insulating system for extra high voltage electrical machine with a spiral winding
US4164772Apr 17, 1978Aug 14, 1979Electric Power Research Institute, Inc.AC fault current limiting circuit
US4177397Mar 17, 1978Dec 4, 1979Amp IncorporatedElectrical connections for windings of motor stators
US4177418Aug 4, 1977Dec 4, 1979International Business Machines CorporationFlux controlled shunt regulated transformer
US4184186Sep 6, 1977Jan 15, 1980General Electric CompanyCurrent limiting device for an electric power system
US4200817Jan 5, 1978Apr 29, 1980Bbc Brown Boveri & Company LimitedΔ-Connected, two-layer, three-phase winding for an electrical machine
US4200818Aug 1, 1978Apr 29, 1980Westinghouse Electric Corp.Resin impregnated aromatic polyamide covered glass based slot wedge for large dynamoelectric machines
US4206395 *Mar 2, 1978Jun 3, 1980Hitachi, Ltd.Harmonic eliminating apparatus
US4206434Aug 29, 1978Jun 3, 1980Hase A MRegulating transformer with magnetic shunt
US4207427Mar 15, 1978Jun 10, 1980Industrie Pirelli S.P.A.Electrical power cable with stranded insulated wires
US4207482Nov 14, 1978Jun 10, 1980Westinghouse Electric Corp.Multilayered high voltage grading system for electrical conductors
US4208597Jun 22, 1978Jun 17, 1980Westinghouse Electric Corp.Stator core cooling for dynamoelectric machines
US4229721Nov 15, 1978Oct 21, 1980Instytut SpawalnictwaWelding transformer with drooping voltage-current characteristics
US4238339Nov 27, 1978Dec 9, 1980Fridman Vladimir MArrangement for supporting stator end windings of an electric machine
US4239999Nov 28, 1977Dec 16, 1980Filippov Iosif FSuper-conductive electrical machine having an improved system for maintaining vacuum in the stator/rotor space
US4245182Mar 28, 1978Jan 13, 1981Hitachi, Ltd.Excitation control apparatus for a generator
US4246694May 26, 1978Jan 27, 1981Kabel-Und Metallwerke Gutehoffnungshutte AktiengesellschaftMethod of making linear motor stator
US4255684Aug 3, 1979Mar 10, 1981Mischler William RLaminated motor stator structure with molded composite pole pieces
US4258280Dec 23, 1977Mar 24, 1981Bbc Brown Boveri & Company LimitedSupporting structure for slow speed large diameter electrical machines
US4262209Feb 26, 1979Apr 14, 1981Berner Charles ASupplemental electrical power generating system
US4274027Sep 20, 1979Jun 16, 1981Hitachi, Ltd.Salient pole rotor with shielding rods between adjacent poles
US4281264Feb 26, 1979Jul 28, 1981General Electric CompanyMounting of armature conductors in air-gap armatures
US4292558Aug 15, 1979Sep 29, 1981Westinghouse Electric Corp.Support structure for dynamoelectric machine stators spiral pancake winding
US4307311Apr 16, 1980Dec 22, 1981Robert Bosch GmbhWinding method for an electrical generator and generator manufactured by the method
US4308476Nov 21, 1975Dec 29, 1981Bbc Brown Boveri & Co. Ltd.Bar windings for electrical machines
US4308575Dec 13, 1979Dec 29, 1981Tokyo Shibaura Denki Kabushiki KaishaPower source system
US4310966Jun 6, 1979Jan 19, 1982Kabel-Und Metallwerke Gutehoffnungshutte AgMethod of making a stator for linear motor
US4314168May 20, 1980Feb 2, 1982Kabel-Und Metallwerke Gutehoffnungshuette A.G.Prefabricated stator windings
US4317001Sep 18, 1980Feb 23, 1982Pirelli Cable Corp.Irradiation cross-linked polymeric insulated electric cable
US4320645Oct 11, 1979Mar 23, 1982Card-O-Matic Pty. LimitedApparatus for fabricating electrical equipment
US4321426Nov 13, 1979Mar 23, 1982General Electric CompanyBonded transposed transformer winding cable strands having improved short circuit withstand
US4321518May 25, 1978Mar 23, 1982Mitsubishi Denki Kabushiki KaishaInductor type synchronous motor driving system for minute control of the position and the rotation angle of the motor
US4330726Dec 4, 1980May 18, 1982General Electric CompanyAir-gap winding stator construction for dynamoelectric machine
US4337922Mar 25, 1980Jul 6, 1982Mathias Streiff AgApparatus for laying and securing heavy electrical cables
US4341989Feb 26, 1980Jul 27, 1982Elmekano I Lulea AbDevice for phase compensation and excitation of an asynchronous machine operating as a generator
US4347449Mar 6, 1980Aug 31, 1982Societe Nationale Industrielle AerospatialeProcess for making a magnetic armature of divided structure and armature thus obtained
US4347454Aug 16, 1979Aug 31, 1982Siemens AktiengesellschaftStator winding for an electric machine
US4353612Jun 6, 1980Oct 12, 1982The National Telephone Supply CompanyShield connector
US4357542Jul 12, 1979Nov 2, 1982Westinghouse Electric Corp.Wind turbine generator system
US4360748Feb 18, 1981Nov 23, 1982Kabel-Und Metallwerke Gutehoffnungshutte AgPolyphase stator system for a linear motor
US4361723Mar 16, 1981Nov 30, 1982Harvey Hubbell IncorporatedInsulated high voltage cables
US4365178Jun 8, 1981Dec 21, 1982General Electric Co.Laminated rotor for a dynamoelectric machine with coolant passageways therein
US4367425Jun 1, 1981Jan 4, 1983Westinghouse Electric Corp.Impregnated high voltage spacers for use with resin filled hose bracing systems
US4367890Feb 2, 1981Jan 11, 1983Siemens AktiengesellschaftTurbine set with a generator feeding a network of constant frequency
US4368418Apr 21, 1981Jan 11, 1983Power Technologies, Inc.Apparatus for controlling high voltage by absorption of capacitive vars
US4369389Apr 28, 1981Jan 18, 1983Dietrich LambrechtDevice for securing winding bars in slots of electric machines, especially turbo-generators
US4371745Nov 7, 1980Feb 1, 1983Kabushiki Kaisha Kawai Gakki SeisakushoShielded wire
US4384944Sep 3, 1981May 24, 1983Pirelli Cable CorporationCarbon filled irradiation cross-linked polymeric insulation for electric cable
US4401920May 11, 1981Aug 30, 1983Canadian Patents & Development LimitedLaser triggered high voltage rail gap switch
US4403163Aug 19, 1981Sep 6, 1983Brown, Boveri & Cie AgConductor bar for electric machines and method of manufacture thereof
US4404486Dec 24, 1980Sep 13, 1983General Electric CompanyStar connected air gap polyphase armature having limited voltage gradients at phase boundaries
US4411710Apr 2, 1981Oct 25, 1983The Fujikawa Cable Works, LimitedMethod for manufacturing a stranded conductor constituted of insulated strands
US4421284Aug 19, 1981Dec 20, 1983Northern Telecom LimitedReeling of cable
US4425521Jun 3, 1982Jan 10, 1984General Electric CompanyMagnetic slot wedge with low average permeability and high mechanical strength
US4426771Oct 27, 1981Jan 24, 1984Emerson Electric Co.Method of fabricating a stator for a multiple-pole dynamoelectric machine
US4429244Sep 29, 1980Jan 31, 1984Vsesojuzny Proektnoizyskatelsky I Nauchno-Issledovatelsky Institut "Gidroproekt"Stator of generator
US4431960Nov 6, 1981Feb 14, 1984Fdx Patents Holding Company, N.V.Current amplifying apparatus
US4432029Jul 2, 1982Feb 14, 1984Asea AktiebolagProtective means for series capacitors
US4437464Nov 9, 1981Mar 20, 1984C.R. Bard, Inc.Electrosurgical generator safety apparatus
US4443725Jun 14, 1982Apr 17, 1984General Electric CompanyDynamoelectric machine stator wedge
US4470884Aug 7, 1981Sep 11, 1984National Ano-Wire, Inc.High speed aluminum wire anodizing machine and process
US4473765Sep 30, 1982Sep 25, 1984General Electric CompanyElectrostatic grading layer for the surface of an electrical insulation exposed to high electrical stress
US4475075Oct 14, 1981Oct 2, 1984Munn Robert BElectric power generator and system
US4477690Dec 18, 1980Oct 16, 1984Nikitin Pavel ZCoupling unit of two multilayer cables of high-voltage generator stator winding
US4481438Sep 13, 1982Nov 6, 1984Electric Power Research Institute, Inc.High voltage electrical generator and windings for use therein
US4484106Sep 10, 1982Nov 20, 1984Canadian Patents & Development LimitedUV Radiation triggered rail-gap switch
US4488079Mar 30, 1984Dec 11, 1984Westinghouse Electric Corp.Dynamoelectric machine with stator coil end turn support system
US4490651Dec 7, 1982Dec 25, 1984Canadian Patents & Development LimitedLaser triggered high voltage rail gap switch
US4503284Nov 9, 1983Mar 5, 1985Essex Group, Inc.RF Suppressing magnet wire
US4508251Oct 26, 1982Apr 2, 1985Nippon Telegraph And Telephone Public Corp.Cable pulling/feeding apparatus
US4510077Nov 3, 1983Apr 9, 1985General Electric CompanySemiconductive glass fibers and method
US4517471 *Jul 23, 1982May 14, 1985Anton Piller Gmbh & Co. KgRotary converter machine for direct transfer of electric energy by flux linkage between windings on a stator pack
US4520287May 23, 1983May 28, 1985Emerson Electric Co.Stator for a multiple-pole dynamoelectric machine and method of fabricating same
US4523249Sep 13, 1983Jun 11, 1985Mitsubishi Denki Kabushiki KaishaAlternating current limiting apparatus
US4538131Nov 30, 1983Aug 27, 1985Bbc Brown, Boveri & Company, Ltd.Air-core choke coil
US4546210Jun 3, 1983Oct 8, 1985Hitachi, Ltd.Litz wire
US4551780Mar 9, 1981Nov 5, 1985Bbc Brown, Boveri & Company, LimitedApparatus for reducing subsynchronous frequencies in a power supply
US4557038Jun 27, 1984Dec 10, 1985Kabelmetal Electro GmbhInstalling a prefabricated winding of a linear motor
US4560896Oct 1, 1984Dec 24, 1985General Electric CompanyComposite slot insulation for dynamoelectric machine
US4565929Sep 29, 1983Jan 21, 1986The Boeing CompanyWind powered system for generating electricity
US4571453May 15, 1984Feb 18, 1986The Fujikura Cable Works, LimitedConductor for an electrical power cable
US4588916Jan 28, 1985May 13, 1986General Motors CorporationEnd turn insulation for a dynamoelectric machine
US4589048 *Jan 17, 1984May 13, 1986Mitsubishi Denki Kabushiki KaishaApparatus for detecting ground fault in variable-voltage variable-frequency power system
US4590416Nov 9, 1984May 20, 1986Rig Efficiency, Inc.Closed loop power factor control for power supply systems
US4594630Jun 2, 1980Jun 10, 1986Electric Power Research Institute, Inc.Emission controlled current limiter for use in electric power transmission and distribution
US4607183Nov 14, 1984Aug 19, 1986General Electric CompanyDynamoelectric machine slot wedges with abrasion resistant layer
US4615109Aug 22, 1985Oct 7, 1986Thyssen Industrie Kabelmetal Electro GmbHApparatus for installing a prefabricated winding of a linear motor
US4615778Feb 19, 1985Oct 7, 1986General Electric CompanyProcess for electrodepositing mica on coil or bar connections and resulting products
US4618795Apr 10, 1985Oct 21, 1986Westinghouse Electric Corp.Turbine generator stator end winding support assembly with decoupling from the core
US4619040Mar 18, 1985Oct 28, 1986Emerson Electric Co.Method of fabricating stator for a multiple pole dynamoelectric machine
US4622116Jul 5, 1985Nov 11, 1986General Electric CompanyProcess for electrodepositing mica on coil or bar connections and resulting products
US4623830 *Jul 10, 1984Nov 18, 1986Bbc Brown, Boveri & Company, LimitedAlternating-current machine drive
US4630163 *Jan 31, 1985Dec 16, 1986Efi CorporationMethod and apparatus for a transient-suppression network
US4633109Oct 23, 1985Dec 30, 1986Standard Elektrik Lorenz AktiengesellschaftElectronically commutated, collectorless direct-current motor
US4650924Jul 24, 1984Mar 17, 1987Phelps Dodge Industries, Inc.Ribbon cable, method and apparatus, and electromagnetic device
US4652963Feb 27, 1985Mar 24, 1987Asea AktiebolagSeries capacitor equipment
US4656316Oct 23, 1985Apr 7, 1987Siemens AktiengesellschaftSplice protective insert for cable sleeves
US4656379Dec 18, 1985Apr 7, 1987The Garrett CorporationHybrid excited generator with flux control of consequent-pole rotor
US4677328Nov 4, 1985Jun 30, 1987Rikichi KumakuraGenerator for use on bicycle
US4687882Apr 28, 1986Aug 18, 1987Stone Gregory CSurge attenuating cable
US4692731Apr 3, 1986Sep 8, 1987U.S. Philips CorporationComposite wire, coil and deflection unit for HF applications
US4723083Apr 4, 1986Feb 2, 1988General Electric CompanyElectrodeposited mica on coil bar connections and resulting products
US4723104Oct 2, 1985Feb 2, 1988Frederick RohatynEnergy saving system for larger three phase induction motors
US4724345Jun 30, 1986Feb 9, 1988General Electric CompanyElectrodepositing mica on coil connections
US4732412Dec 19, 1986Mar 22, 1988Nv Raychem S.A.Coated recoverable articles
US4737704Nov 6, 1986Apr 12, 1988Kalinnikov Semen ATransformer for arc and plasma setups having broad current adjustment range
US4745314Nov 13, 1985May 17, 1988Fanuc Ltd.Liquid-cooled motor
US4757435 *Feb 26, 1987Jul 12, 1988Westinghouse Electric Corp.Static-controlled current-source AC/DC power converter and DC/AC power converter, and protection system embodying the same
US4761602Jul 10, 1986Aug 2, 1988Gregory LeibovichCompound short-circuit induction machine and method of its control
US4766365Jul 20, 1987Aug 23, 1988Hydro QuebecSelf-regulated transformer-inductor with air gaps
US4771168May 4, 1987Sep 13, 1988The University Of Southern CaliforniaLight initiated high power electronic switch
US4785138Oct 31, 1986Nov 15, 1988Kabel Electro Gesellschaft mit beschrankter HaftungElectric cable for use as phase winding for linear motors
US4795933Jul 28, 1983Jan 3, 1989Hitachi, Ltd.Salient-pole rotary electric machine
US4812669 *Jun 25, 1987Mar 14, 1989Mitsubishi Denki Kabushiki KaishaHarmonic suppressing device
US4827172Mar 9, 1988May 2, 1989Mitsuba Electric Mfg., Co., Ltd.Dc motor with rotor slots closely spaced
US4845308Jul 20, 1987Jul 4, 1989The Babcock & Wilcox CompanySuperconducting electrical conductor
US4847747Sep 26, 1988Jul 11, 1989Westinghouse Electric Corp.Commutation circuit for load-commutated inverter induction motor drives
US4853565Aug 23, 1984Aug 1, 1989General Electric CompanySemi-conducting layer for insulated electrical conductors
US4859810Jul 9, 1987Aug 22, 1989Bp Chemicals LimitedWater-tree stable electrical insulating polymeric compositions
US4859989Dec 1, 1987Aug 22, 1989W. L. Gore & Associates, Inc.Security system and signal carrying member thereof
US4860430Nov 7, 1988Aug 29, 1989Kabelmetal Electro GmbhCompleting a linear motor stator
US4864266Nov 29, 1988Sep 5, 1989Electric Power Research Institute, Inc.High-voltage winding for core-form power transformers
US4883230Jun 7, 1988Nov 28, 1989Kabmatik AbCable switching device
US4890040Jun 1, 1987Dec 26, 1989Gundersen Martin AOptically triggered back-lighted thyratron network
US4894284Nov 8, 1983Jan 16, 1990Sumitomo Electric Industries, Ltd.Cross-linked polyethylene-insulated cable
US4914386Apr 28, 1988Apr 3, 1990Abb Power Distribution Inc.Method and apparatus for providing thermal protection for large motors based on accurate calculations of slip dependent rotor resistance
US4918347Sep 23, 1988Apr 17, 1990Tamagawa Seiki Kabushiki KaishaCoil winding construction for an electric motor
US4918835May 23, 1989Apr 24, 1990Kabelmetal Electro GmbhApparatus for completing a linear motor stator
US4924342Aug 3, 1988May 8, 1990Teledyne InetLow voltage transient current limiting circuit
US4926079Oct 17, 1988May 15, 1990Ryobi Motor Products Corp.Motor field winding with intermediate tap
US4942326Apr 19, 1989Jul 17, 1990Westinghouse Electric Corp.Biased securement system for end winding conductor
US4949001Jul 21, 1989Aug 14, 1990Campbell Steven RPartial discharge detection method and apparatus
US4982147Jan 30, 1989Jan 1, 1991State Of Oregon Acting By And Through The State Board Of Higher Education On Behalf Of Oregon State UniversityPower factor motor control system
US4994952Sep 20, 1989Feb 19, 1991Electronics Research Group, Inc.Low-noise switching power supply having variable reluctance transformer
US4997995Oct 13, 1989Mar 5, 1991Pirelli General PlcExtra-high-voltage power cable
US5012125Jun 3, 1987Apr 30, 1991Norand CorporationShielded electrical wire construction, and transformer utilizing the same for reduction of capacitive coupling
US5030813Feb 6, 1990Jul 9, 1991Pulsair Anstalt CorporationWelding apparatus and transformer therefor
US5036165Jul 23, 1990Jul 30, 1991General Electric Co.Semi-conducting layer for insulated electrical conductors
US5036238Jul 11, 1990Jul 30, 1991Mitsubishi Denki Kabushiki KaishaRotor of salient-pole type rotary machine
US5066881Jul 23, 1990Nov 19, 1991General Electric CompanySemi-conducting layer for insulated electrical conductors
US5067046May 15, 1989Nov 19, 1991General Electric CompanyElectric charge bleed-off structure using pyrolyzed glass fiber
US5083360Sep 28, 1988Jan 28, 1992Abb Power T&D Company, Inc.Method of making a repairable amorphous metal transformer joint
US5086246Feb 5, 1991Feb 4, 1992General Electric Canada Inc.Salient pole rotor for a dynamoelectric machine
US5091609Feb 13, 1990Feb 25, 1992Sumitomo Electric Industries, Ltd.Insulated wire
US5094703Sep 27, 1988Mar 10, 1992The Fujikura Cable Works LimitedConductor for an electrical power cable and a method for manufacturing the same
US5095175Apr 24, 1991Mar 10, 1992Hitachi Cable, Ltd.Water-tight rubber or plastic insulated cable
US5097241Dec 29, 1989Mar 17, 1992Sundstrand CorporationCooling apparatus for windings
US5097591Jul 19, 1991Mar 24, 1992Kabelmetal Electro Gesellschaft Mit Beschrankter HaftungDevice for removing the winding of a linear motor
US5111095Nov 28, 1990May 5, 1992Magna Physics CorporationPolyphase switched reluctance motor
US5124607May 19, 1989Jun 23, 1992General Electric CompanyDynamoelectric machines including metal filled glass cloth slot closure wedges, and methods of making the same
US5132278 *May 11, 1990Jul 21, 1992Advanced Technology Materials, Inc.Superconducting composite article, and method of making the same
US5136459Mar 13, 1989Aug 4, 1992Electric Power Research Institute, Inc.High speed current limiting system responsive to symmetrical & asymmetrical currents
US5140290Nov 14, 1991Aug 18, 1992Asea Brown Boveri Ltd.Device for inductive current limiting of an alternating current employing the superconductivity of a ceramic high-temperature superconductor
US5153460Mar 25, 1991Oct 6, 1992The United States Of America As Represented By The Secretary Of The ArmyTriggering technique for multi-electrode spark gap switch
US5168662Jan 15, 1992Dec 8, 1992Fanuc Ltd.Process of structuring stator of built-in motor
US5171941Mar 13, 1991Dec 15, 1992The Furukawa Electric Co., Ltd.Superconducting strand for alternating current
US5182537Aug 26, 1991Jan 26, 1993U.S. Philips CorporationTransformer with twisted conductors
US5187428Feb 26, 1991Feb 16, 1993Miller Electric Mfg. Co.Shunt coil controlled transformer
US5231249Feb 22, 1991Jul 27, 1993The Furukawa Electric Co., Ltd.Insulated power cable
US5235488Feb 5, 1992Aug 10, 1993Brett Products, Inc.Wire wound core
US5246783Aug 15, 1991Sep 21, 1993Exxon Chemical Patents Inc.Electrical devices comprising polymeric insulating or semiconducting members
US5264778Dec 31, 1991Nov 23, 1993Westinghouse Electric Corp.Apparatus protecting a synchronous machine from under excitation
US5287262Apr 13, 1992Feb 15, 1994Heraeus Lasersonics, Inc.High voltage resonant inverter for capacitive load
US5304883Sep 3, 1992Apr 19, 1994Alliedsignal IncRing wound stator having variable cross section conductors
US5305961Jun 12, 1992Apr 26, 1994Gec Alsthom SaMethod of winding an electrical coil as successive oblique layers of coil turns
US5321308Jul 14, 1993Jun 14, 1994Tri-Sen Systems Inc.Control method and apparatus for a turbine generator
US5323330Oct 16, 1992Jun 21, 1994Asea Brown Boveri AbReduction of disturbances in a power network
US5325008Dec 9, 1992Jun 28, 1994General Electric CompanyConstrained ripple spring assembly with debondable adhesive and methods of installation
US5325259Nov 26, 1990Jun 28, 1994Asea Brown Boveri AbOvervoltage protection for series capacitor equipment
US5327637Jan 28, 1993Jul 12, 1994Kabelmetal Electro GmbhProcess for repairing the winding of an electrical linear drive
US5341281May 14, 1993Aug 23, 1994Allen-Bradley Company, Inc.Harmonic compensator using low leakage reactance transformer
US5343139Jan 31, 1992Aug 30, 1994Westinghouse Electric CorporationGeneralized fast, power flow controller
US5355046Apr 27, 1992Oct 11, 1994Klaus WeigeltStator end-winding system and a retrofitting set for same
US5365132May 27, 1993Nov 15, 1994General Electric CompanyLamination for a dynamoelectric machine with improved cooling capacity
US5387890Nov 4, 1993Feb 7, 1995Gec Alsthom T & D SaSuperconductive coil assembly particularly for a current limiter, and a current limiter including such a coil assembly
US5397513Jun 2, 1993Mar 14, 1995Nupipe, Inc.Method for installing a length of substantially rigid thermoplastic pipe in an existing conduit
US5399941May 3, 1993Mar 21, 1995The United States Of America As Represented By The Secretary Of The NavyOptical pseudospark switch
US5400005Mar 22, 1993Mar 21, 1995Albar, IncorporatedToroidal transformer with magnetic shunt
US5408169Jun 22, 1993Apr 18, 1995Smh Management Services AgDevice for controlling an asynchronous motor
US5444609 *Mar 25, 1993Aug 22, 1995Energy Management CorporationPassive harmonic filter system for variable frequency drives
US5449861Feb 24, 1994Sep 12, 1995Vazaki CorporationWire for press-connecting terminal and method of producing the conductive wire
US5452170Feb 12, 1993Sep 19, 1995Hitachi, Ltd.Commutation type DC breaker
US5468916Apr 30, 1993Nov 21, 1995Asea Brown Boveri Ltd.Means for fixing winding overhangs in electrical machines
US5491624 *Oct 24, 1994Feb 13, 1996Square D CompanyAC to DC power conversion system
US5499178Feb 10, 1994Mar 12, 1996Regents Of The University Of MinnesotaSystem for reducing harmonics by harmonic current injection
US5500632May 11, 1994Mar 19, 1996Halser, Iii; Joseph G.Wide band audio transformer with multifilar winding
US5510942Dec 19, 1994Apr 23, 1996General Electric CompanySeries-capacitor compensation equipment
US5530307Mar 28, 1994Jun 25, 1996Emerson Electric Co.Flux controlled permanent magnet dynamo-electric machine
US5533658Nov 10, 1994Jul 9, 1996Production Tube, Inc.Apparatus having replaceable shoes for positioning and gripping tubing
US5534754Jun 29, 1994Jul 9, 1996Cableco, Poumey, Gaz De Bordeaux And General Export Industries - SogexiApparatus for supplying electrical power to an arc lamp including resonant circuit
US5545853Jul 19, 1993Aug 13, 1996Champlain Cable CorporationSurge-protected cable
US5550410Aug 2, 1994Aug 27, 1996Titus; Charles H.Gas turbine electrical power generation scheme utilizing remotely located fuel sites
US5583387Jun 13, 1994Dec 10, 1996Matsushita Electric Industrial Co., Ltd.Stator of dynamo-electric machine
US5587126Jun 7, 1995Dec 24, 1996Nupipe, Inc.Method of manufacturing a pipe liner for installation in an existing conduit
US5598137Mar 5, 1992Jan 28, 1997Siemens AktiengesellschaftCoil for high-voltage transformer
US5607320Sep 28, 1995Mar 4, 1997Osram Sylvania Inc.Cable clamp apparatus
US5612510Oct 11, 1994Mar 18, 1997Champlain Cable CorporationHigh-voltage automobile and appliance cable
US5663605May 3, 1995Sep 2, 1997Ford Motor CompanyRotating electrical machine with electromagnetic and permanent magnet excitation
US5672926Feb 20, 1996Sep 30, 1997Siemens AktiengesellschaftHybrid-energized electric machine
US5689223Apr 22, 1996Nov 18, 1997Asea Brown Boveri AgSuperconducting coil
US5734249 *Mar 5, 1997Mar 31, 1998Asea Brown Boveri AgMethod and apparatus for direct torque control of a three-phase machine
US5807447Oct 16, 1996Sep 15, 1998Hendrix Wire & Cable, Inc.Neutral conductor grounding system
US5834699Sep 10, 1997Nov 10, 1998The Whitaker CorporationCable with spaced helices
US5905647 *Dec 31, 1997May 18, 1999Kabushiki Kaisha ToshibaInverter with incorporated filter circuit and improved component cooling arrangement
US5990654 *Jan 21, 1998Nov 23, 1999Allen-Bradley Company, LlcApparatus for eliminating motor voltage reflections and reducing EMI currents
US6038151 *Jul 17, 1998Mar 14, 2000Lucent Technologies Inc.Switching network and method of reducing input current total harmonic distortion for a boost converter
AT399790B Title not available
CH266037A Title not available
CH391071A Title not available
CH534448A Title not available
CH539328A Title not available
CH646403A5 Title not available
CH657482A5 Title not available
DE336418CMay 2, 1921Stanislaus BergerTraeger fuer an Waenden zu fuehrende elektrische Leitungen
DE372390CDec 9, 1915Mar 27, 1923Bergmann Elektricitaet AgMaschine zur Umformung oder zur gleichzeitigen Erzeugung von Wechselstroemen verschiedener Frequenz bei gleicher oder verschiedener Phasenzahl
DE386561CDec 13, 1923Bergmann Elektricitaet AgMaschine zur Umformung oder zur gleichzeitigen Erzeugung von Wechselstroemen verschiedener Frequenz
DE387973CJun 4, 1921Jan 9, 1924Poege Elek Citaets AgAnordnung der Spulen zur Verringerung der Streuung bei Transformatoren mit scheibenartigem Wicklungsaufbau
DE406371CNov 21, 1924Bergmann Elektricitaet AgMaschine zur Umformung oder zur gleichzeitigen Erzeugung von Wechselstroemen verschiedener Frequenz mit zweckmaessig auf einem Induktor vereinigten Feldern verschiedenerPolzahl und diesen Feldern zugeordneten, gegebenenfalls zu einer gemeinsamen Wicklung zusamengefassten induzierten Wicklungen
DE425551CFeb 20, 1926Bbc Brown Boveri & CieEinrichtung zum magnetischen Verschluss offener Nuten in elektrischen Maschinen
DE426793CMar 18, 1926Bbc Brown Boveri & CieEinrichtung zum magnetischen Verschluss offener Nuten in elektrischen Maschinen
DE432169CJan 15, 1924Jul 26, 1926Bbc Brown Boveri & CieEinrichtung zum magnetischen Verschluss offener Nuten in elektrischen Maschinen
DE433749CNov 25, 1923Sep 7, 1926Bbc Brown Boveri & CieSpulenwicklung von Wechselstrommaschinen, die sehr starke Stroeme fuehren, mit ringfoermigen Verbindungsleitern
DE435608COct 18, 1926Bbc Brown Boveri & CieUnterteilter Leiter fuer elektrische Maschinen
DE435609CMar 2, 1924Oct 18, 1926Bbc Brown Boveri & CieUnterteilter Leiter fuer elektrische Maschinen
DE441717CMar 2, 1924Mar 11, 1927Bbc Brown Boveri & CieUnterteilter Leiter fuer elektrische Maschinen
DE443011CJul 18, 1920Apr 13, 1927Bbc Brown Boveri & CieEinrichtung an Hochspannungswicklungen elektrischer Maschinen
DE460124COct 10, 1922May 22, 1928Bbc Brown Boveri & CieLamellierter magnetischer Keil zum Abschluss der Wicklungsnuten elektrischer Maschinen
DE468827CAug 7, 1926Nov 23, 1928Friedrich PfaffenbergerInhalator
DE482506CJul 9, 1921Sep 14, 1929Bbc Brown Boveri & CieEinrichtung zur kurzschlusssicheren Befestigung von evolventenfoermig ausgebildeten Staenderwicklungskoepfen luftgekuehlter elektrischer Maschinen
DE501181CFeb 19, 1927Jul 3, 1930Felten & Guilleaume CarlswerkVerfahren zur Herstellung von Seilen fuer elektrische Freileitungen
DE523047CApr 18, 1931Brown Boveir & Cie AgVerfahren zur Herstellung von Nutenkeilen mit quer zur Laengsrichtung des Keiles geschichteten Eisenblechten fuer elektrische Maschinen
DE568508CJan 20, 1933Bbc Brown Boveri & CieWechselstrom-Hochspannungsgenerator mit mindestens zwei elektrisch getrennten Wicklungen
DE572030CMar 9, 1933Bbc Brown Boveri & CieKuehleinrichtung fuer die Wicklungskoepfe von Hochspannungsmaschinen
DE584639CDec 28, 1929Sep 27, 1933AegGlimmschutz fuer Wicklungen elektrischer Maschinen
DE586121CMay 1, 1932Oct 18, 1933Felix Kleiss Dipl IngVerfahren zum Durchfuehren von Draehten und Baendern durch Baeder
DE604972CFeb 27, 1931Oct 12, 1934Otis Aufzugswerke Ges M B HTuerantrieb fuer Aufzuege
DE629301CFeb 28, 1929Apr 27, 1936Hartstoff Metall Akt Ges HametEisenkern fuer elektrische Maschinen
DE673545CJul 30, 1936Mar 24, 1939Siemens AgAus Einsphasentransformatoren bestehender mehrphasiger Streutransformator
DE719009CMay 30, 1935Mar 26, 1942AegEinrichtung zum Betrieb von elektrischen Bahnspeisewerken
DE846583CFeb 18, 1949Aug 14, 1952Siemens AgEisenkern fuer elektrische Geraete, insbesondere Transformatoren, Drosseln od. dgl.
DE875227CDec 31, 1948Apr 30, 1953Siemens AgDrehfeldmaschine mit konzentrierten Wicklungen und ausgepraegten, mit Polschuhen versehenen Polen
DE975999CSep 16, 1944Jan 10, 1963Siemens AgVerfahren und Einrichtung zum Betrieb von Einphasenbahnfahrleitungen, die von mindestens zwei Speisepunkten aus gespeist werden
DE1465719A1Feb 22, 1964May 22, 1969IbmTransformatorkabel mit mehreren koaxialen Leitern und Verfahren zu ihrer Herstellung
DE1638176UFeb 12, 1952May 15, 1952Bosch & SpeidelManschette fuer blutdruckmessung.
DE1807391UAug 29, 1959Mar 3, 1960Heinrich UngruheUnterlegring fuer fitschenbaender.
DE2050674B2Oct 15, 1970Nov 23, 1972 Title not available
DE2155371C2Nov 8, 1971Jun 24, 1982Appt, Geb. Kirschmann, Emma, 7000 Stuttgart, DeTitle not available
DE2400698A1Jan 8, 1974Jul 10, 1975Krim Samhalov IzmailSelf-excited machine with two separate stator windings - windings star-connected with second capacitively closed for excitation
DE2520511C3May 7, 1975Nov 30, 1978Siemens Ag, 1000 Berlin Und 8000 MuenchenTitle not available
DE2656389C3Dec 13, 1976Nov 29, 1979Siemens Ag, 1000 Berlin Und 8000 MuenchenTitle not available
DE2721905C2May 14, 1977Feb 20, 1986Thyssen Industrie Ag, 4300 Essen, DeTitle not available
DE2824951A1Jun 7, 1978Dec 20, 1979Kabel Metallwerke GhhVerfahren zur herstellung eines stators fuer einen linearmotor
DE2835386A1Aug 12, 1978Feb 21, 1980Kabel Metallwerke GhhThree=phase AC winding for linear motor - is made by preforming cables which are wound on drum, fastened on supports and then placed in slots
DE2839517C2Sep 11, 1978May 7, 1986Thyssen Industrie Ag, 4300 Essen, DeTitle not available
DE2854520A1Dec 16, 1978Jun 26, 1980Bbc Brown Boveri & CieElektrische spule
DE2913697C2Apr 5, 1979May 22, 1986Kabelmetal Electro Gmbh, 3000 Hannover, DeTitle not available
DE2917717C2May 2, 1979Aug 20, 1987Kraftwerk Union Ag, 4330 Muelheim, DeTitle not available
DE2920478C2May 21, 1979Jun 26, 1986Kabelmetal Electro Gmbh, 3000 Hannover, DeTitle not available
DE2939004A1Sep 26, 1979Apr 9, 1981Siemens AgSynchronous linear motor for rail vehicle drive - has field winding divided into switched sections with inter-looped current lines
DE3006382C2Feb 21, 1980Oct 31, 1985Thyssen Industrie Ag, 4300 Essen, DeTitle not available
DE3008818A1Mar 5, 1980Sep 10, 1981Siemens AgJointing sleeve for HT cables - with plastic cylinder over metal tube and insulating tape wraps
DE3009102C2Mar 10, 1980Apr 11, 1985Proizvodstvennoe Ob"Edinenie Uralelektrotjazmas Imeni V.I. Lenina, Sverdlovsk, SuTitle not available
DE3028777A1Jul 29, 1980Mar 26, 1981Westinghouse Electric CorpStatoranordnung fuer dynamoelektrische maschinen
DE3305225C2Feb 16, 1983Aug 22, 1991Bbc Brown Boveri Ag, Baden, Aargau, ChTitle not available
DE3309051C2Mar 14, 1983Oct 2, 1986Thyssen Industrie Ag, 4300 Essen, DeTitle not available
DE3441311A1Nov 12, 1984May 15, 1986Siemens AgSpleissschutzeinlage fuer kabelmuffen aus schrumpfbarem material
DE3543106C2Dec 6, 1985Jun 7, 1990Kabelmetal Electro Gmbh, 3000 Hannover, DeTitle not available
DE3612112A1Apr 10, 1986Oct 15, 1987Siemens AgBracing for the teeth of the stator of a turbogenerator
DE3726346A1Aug 7, 1987Feb 16, 1989Vacuumschmelze GmbhAnnular core (ring core) for current sensors
DE3925337A1Jul 31, 1989Feb 7, 1991Loher AgElectric motor with housing accommodating stator surrounding rotor - has cooling ducts running axially so gaseous cooling medium under high pressure is fed in closed cooling circuit
DE4022476A1Jul 14, 1990Jan 16, 1992Thyssen IndustrieElectric cable for three=phase AC winding of linear motor - covers one phase by inner conducting layer surrounded by insulation and outer conducting layer
DE4023903C1Jul 27, 1990Nov 7, 1991Micafil Ag, Zuerich, ChPlanar insulator for electrical machine or appts. - is laminated construction withstanding high mechanical loading and with curved edges for fitting into grooves
DE4233558C2Sep 30, 1992Jul 20, 1995Siemens AgElektrische Maschine
DE4402184C2Jan 26, 1994Nov 23, 1995Friedrich Prof Dr Ing KlingerVielpol-Synchrongenerator für getriebelose Horizontalachsen-Windkraftanlagen mit Nennleistungen bis zu mehreren Megawatt
DE4409794C1Mar 22, 1994Aug 24, 1995Vem Elektroantriebe GmbhFastening for equalising connection lines of high-power DC machines
DE4412761C2Apr 13, 1994Apr 10, 1997Siemens AgLeiterdurchführung für ein Wechselstromgerät mit Supraleitung
DE4420322C2Jun 13, 1994Feb 27, 1997Dresden Ev Inst FestkoerperYBa¶2¶Cu¶3¶O¶X¶-Hochtemperatur-Supraleiter und Verfahren zu dessen Herstellung
DE4438186A1Oct 26, 1994May 2, 1996Abb Management AgOperation of sync electrical machine mechanically coupled to gas-turbine
DE19547229A1Dec 18, 1995Jun 19, 1997Asea Brown BoveriPacking strips for large rotary electrical machine stator winding
DE19620906C2May 24, 1996Feb 10, 2000Siemens AgWindenergiepark
EP0056580B1Jan 7, 1982Aug 28, 1985Smit Transformatoren B.V.Winding for an air-cooled dry transformer or reactor having spacers in the air channels
EP0102513B1Jul 27, 1983Jan 22, 1986Transformatoren Union AktiengesellschaftAir-cooled transformer with windings embedded in cast resin
EP0120154A1Mar 25, 1983Oct 3, 1984TRENCH ELECTRIC, a Division of Guthrie Canadian Investments LimitedContinuously transposed conductor
EP0130124B1Jun 21, 1984Oct 14, 1987National Aeronautics And Space AdministrationHigh voltage isolation transformer
EP0142813B1Nov 13, 1984Apr 26, 1989S.A.M.P. S.p.A. Meccanica di PrecisioneRobot device for loading and unloading spools in wire winding machines
EP0155405B1Dec 27, 1984Nov 4, 1987Siemens AktiengesellschaftDevice for indirect gas cooling of stator windings and/or for the direct gas cooling of stator laminated magnetic cores of a dynamo-electric machine, particularly for gas-cooled turbogenerators
EP0174783B1Aug 30, 1985Nov 22, 1990Utdc Inc.Linear induction motors
EP0185788B1Dec 21, 1984Aug 24, 1988Audi AgWire-feeding device for an insulated wire cutting and stripping apparatus
EP0221404B1Oct 14, 1986May 16, 1990Gec Alsthom SaSynchronous machine with superconducting windings
EP0234521A3Feb 20, 1987Sep 14, 1988PIRELLI CAVI S.p.A.Electric cable with improved screen and process for constructing said screen
EP0244069B1Mar 12, 1987Jul 20, 1994Gregory Charles StoneSurge attenuating cable
EP0246377A1May 23, 1986Nov 25, 1987Royal Melbourne Institute Of Technology LimitedElectrically-variable inductor
EP0265868B1Oct 23, 1987Jan 12, 1994Hitachi, Ltd.Rotor of induction motor
EP0274691B1Dec 15, 1987May 20, 1992Hitachi, Ltd.Fault diagnosis system for rotor winding of rotary electric machine
EP0277358A3Sep 10, 1982Oct 5, 1988Westech Gear CorporationDraw-off and hold back cable tension machine
EP0280759B1Apr 10, 1987Oct 13, 1993Heinrich Dr. GrohArrangement for electric energy cables for protection against explosions of gas and/or dust/air mixtures, especially for underground working
EP0282876B1Mar 8, 1988Jun 3, 1992Kollmorgen CorporationMethod for winding the coils for an air gap motor
EP0309096B1Aug 24, 1988Apr 28, 1993Westinghouse Electric CorporationSupport for dynamoelectric machine stator coil end portions
EP0314860B1Mar 24, 1988Jun 12, 1996General Electric CompanyStator and rotor lamination construction for a dynamo-electric machine
EP0316911B1Nov 17, 1988Jun 8, 1994Nippon Telegraph And Telephone CorporationCable closure
EP0317248A3Nov 14, 1988Oct 18, 1989Westinghouse Electric CorporationMethod and apparatus for tensioning and retensioning low-torque nuts for stator core through-bolts
EP0335430B1Feb 22, 1989Nov 11, 1992Lovink-Terborg B.V.Method for protecting elements enclosed by a housing against the influence of moisture
EP0342554B1May 12, 1989Jan 15, 1997Magnet-Motor Gesellschaft für magnetmotorische Technik mbHLiquid-cooled electric machine
EP0375101A1Jun 22, 1989Jun 27, 1990Pirelli Cable CorporationPower cable with metallic shielding tape and water swellable powder
EP0406437B1Jul 18, 1990Mar 16, 1994Fanuc Ltd.Method of fabricating a stator structure of built-in motor
EP0439410A3Jan 25, 1991Jan 29, 1992Branimir JakovljevicLaminate for magnetic core
EP0440865A1Feb 9, 1990Aug 14, 1991Asea Brown Boveri AbElectrical insulation
EP0469155A4Feb 22, 1991Dec 9, 1992The Furukawa Electric Co., Ltd.Olefinic resin composition for power cable, and power cable and junction thereof made from said composition
EP0490705B1Dec 13, 1991Jun 21, 1995Westinghouse Electric CorporationMethod for forming a low-electric stress insulating wall for high voltage coils having roebeled strands
EP0493704B1Dec 6, 1991Apr 5, 1995Loher AktiengesellschaftElectric motor
EP0503817A1Mar 3, 1992Sep 16, 1992Frances Domingo HuarteRotary electromechanical arrangements
EP0571155B1May 17, 1993Aug 28, 1996Mitsuba Electric Manufacturing Co., Ltd.Coating material for armature coil of a motor for electrical equipment
EP0620570B1Mar 25, 1994Feb 12, 1997Ngk Insulators, Ltd.Superconducting fault current limiter
EP0620630A1Mar 25, 1994Oct 19, 1994Ngk Insulators, Ltd.Superconducting fault current limiter
EP0642027B1Aug 17, 1994Oct 17, 2001ABB Power Automation AGMethod and device for detecting earth faults of the conductors in a electrical machine
EP0671632B1Feb 22, 1995Dec 12, 2001Kabushiki Kaisha ToshibaField winding ground fault detector and relay
EP0676777B1Mar 29, 1995Jul 1, 1998Siemens AktiengesellschaftLocomotive transformer and winding device therefor
EP0677915B1Mar 23, 1995Oct 8, 1997Kollmorgen CorporationAxial air gap DC motor
EP0684679B1May 19, 1995Jul 29, 1998ABB Control OYMethod for reducing waveform distortion in an electrical utility system and circuit for an electrical utility system
EP0684682B2Apr 20, 1995Aug 25, 2004Alstom Uk LtdImprovements in or relating to cooling arrangements for rotating electrical machines
EP0695019B1Jul 19, 1995Sep 24, 1997Magneti Marelli Manufacturing SpaA rotor for an electrical machine, in particular for an electric motor for starting the internal combustion engine of a motor vehicle, and a process for its production
EP0732787B1Jan 17, 1996Sep 27, 2000THOMAS &amp; BETTS CORPORATIONForced encapsulation cable splice enclosure including a container for exiting encapsulant
EP0738034B1Apr 3, 1996Jun 16, 1999Switched Reluctance Drives LimitedMethod and apparatus for reducing winding failures in switched reluctance machines
EP0739087B1Apr 19, 1996Aug 14, 2002General Electric CompanyAsynchronous conversion method and apparatus for use with variable speed turbine hydroelectric generation
EP0740315B1Apr 12, 1996Nov 7, 2001ABB Sécheron SASuperconducting coil
EP0749190A3Apr 12, 1996Mar 26, 1997Gen ElectricInterconnection system for electrical systems having differing electrical characteristic
EP0749193B1Jun 12, 1996Sep 15, 1999Matsushita Electric Industrial Co., Ltd.Method of recovering resources in resin-molded electrical rotating device and resin for molding of the device
EP0751605B1Jun 28, 1996Oct 6, 1999Kaman Electromagnetics CorporationDetachable magnet carrier for permanent magnet motor
EP0780926B1Dec 17, 1996Apr 25, 2007Prysmian Cavi e Sistemi Energia S.r.l.Terminal for connecting a superconducting multiphase cable to a room temperature electrical equipment
EP0802542B1Mar 19, 1997Jan 2, 2002NKT Cables A/SA high-voltage cable
EP0913912B1Sep 11, 1998Feb 27, 2002ABB PATENT GmbHMethod of repairing packets of laminations of an electrical machine
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Non-Patent Citations
Reference
136-Kv. Generators Arise from Insulation Research; P. Sidler; Electrical World Oct. 15, 1932, p. 524.
2400-kV XLPE cable system passes CIGRE test; ABB Article; ABB Review Sep. 1995, p. 38.
3A High Initial response Brushless Excitation System; T. L. Dillman et al; IEEE Power Generation Winter Meeting Proceedings, Jan. 31, 1971, pp. 2089-2094.
4A study of equipment sized and constraints for a unified power flow controller; J Bian et al; IEEE 1996.
5A study of equipment sizes and constraints for a unified power flow controller; J. Bian et al; IEEE Transactions on Power Delivery, vol. 12, No. 3, Jul. 1997, pp. 1385-1391.
6A test installation of a self-tuned ac filter in the Konti-Skan 2 HVDC link; T. Holmgren,G. Asplund, S. Valdemarsson, P. Hidman of ABB; U. Jonsson of Svenska Kraftnat; O. loof of Vattenfall Vastsverige AB; IEEE Stockholm Power Tech Conference Jun. 1995, pp. 64-70.
7ABB Elkrathandbok, ABB Distribution AB, ISBN 91-970956-2-1, Jordningssystem, See pp. 274-276 No Date.
8Advanced Turbine-generators- an assessment; A. Appleton, et al; International Conf. Proceedings, Lg HV Elec. Sys. Paris, FR, Aug.-Sep. 1976, vol. I, Section 11-02, pp. 1-9.
9An EHV bulk Power transmission line Made with Low Loss XLPE Cable;Ichihara et al; 8/92; pp. 3-6.
10Analysis of faulted Power Systems; P Anderson, Iowa State University Press / Ames, Iowa, 1973, pp. 255-257.
11Application of high temperature superconductivy to electric motor design; J.S. Edmonds et al; IEEE Transactions on Energy Conversion Jun. 1992, No. 2 , pp. 322-329.
12Billig burk motar overtonen; A. Felldin; ERA (TEKNIK) Aug. 1994, pp. 26-28.
13Canadians Create Conductive Concrete; J. Beaudoin et al; Science, vol. 276, May 23, 1997, p. 1201.
14Characteristics of a laser triggered spark gap using air, Ar, CH4,H2, He, N2, SF6 and Xe; W.D. Kimura et al; Journal of Applied Physics, vol. 63, No. 6, Mar. 15, 1988, pp. 1882-1888.
15Cloth-transformer with divided windings and tension annealed amorphous wire; T. Yammamoto et al; IEEE Translation Journal of Magnetics in Japan vol. 4, No. 9 Sep. 1989.
16Das Einphasenwechselstromsystem hoherer Frequenz; J.G. Heft; Elektrische Bahnen eb; Dec. 1987, pp. 388-389.
17Das Handbuch der Lokomotiven ( hungarian locomotive V40 1"D'); B. Hollingsworth et al; Pawlak Verlagsgesellschaft; 1933, pp. 254-255.
18Das Handbuch der Lokomotiven ( hungarian locomotive V40 1‘D’); B. Hollingsworth et al; Pawlak Verlagsgesellschaft; 1933, pp. 254-255.
19Der Asynchronmotor als Antrieb stopfbcichsloser Pumpen; E. Picmaus; Eletrotechnik und Maschinenbay No. 78, pp. 153-155, 1961.
20Design and Construction of the 4 Tesla Background Coil for the Navy SMES Cable Test Apparatus; D.W.Scherbarth et al; IEEE Appliel Superconductivity, vol. 7, No. 2, Jun. 1997, pp. 840-843.
21Design and manufacture of a large superconducting homopolar motor; A.D. Appleton; IEEE Transactions on Magnetics, vol. 19,No. 3, Part 2, May 1983, pp. 1048-1050.
22Design Concepts for an Amorphous Metal Distribution Transformer; E. Boyd et al; IEEE 11/84.
23Design, manufacturing and cold test of a superconducting coil and its cryostat for SMES applications; A. Bautista et al; IEEE Applied Superconductivity, vol. 7, No. 2, Jun. 1997, pp. 853-856.
24Development of a Termination for the 77 kV-Class High Tc Superconducting Power Cable; T. Shimonosono et al; IEEE Power Delivery, vol. 12, No. 1, Jan. 1997, pp 33-38.
25Development of extruded polymer insulated superconducting cable; Jan. 1992.
26Die Wechselstromtechnik; A. Cour' Springer Verlag, Germany; 1936, pp. 586-598.
27Direct Connection of Generators to HVDC Converters: Main Characteristics and Comparative Advantages; J.Arrillaga et al; Electra No. 149, Aug. 1993, pp. 19-37.
28Direct Generation of alternating current at high voltages; R. Parsons; IEEE Journal, vol. 67 #393, Jan. 15, 1929; pp. 1065-1080.
29Eine neue Type von Unterwassermotoren; Electrotechnik und Maschinenbam, 49; Aug. 1931; pp. 2-3.
30Elektriska Maskiner; F. Gustavson; Institute for Elkreafteknilk, KTH; Stockholm, 1996, pp. 3-6-3-12.
31Elektriska Maskiner; F. Gustavson; Institute for Elkreafteknilk, KTH; Stockholm, 1996, pp. 3-6—3-12.
32Elkraft teknisk Handbok, 2 Elmaskiner; A. Alfredsson et al; 1988, pp. 121-123.
33Elkrafthandboken, Elmaskiner; A. Rejminger; Elkrafthandboken, Elmaskiner 1996, 15-20.
34FREQSYN-a new drive system for high power applications;J-A. Bergman et al; ASEA Journal 59, Apr. 1986, pp.16-19.
35FREQSYN—a new drive system for high power applications;J-A. Bergman et al; ASEA Journal 59, Apr. 1986, pp.16-19.
36Fully slotless turbogenerators; E. Spooner; Proc., IEEE vol. 120 #12, Dec. 1973.
37Fully Water-Cooled 190 MVA Generators in the Tonstad Hydroelectric Power Station; E. Ostby et al; BBC Review Aug. 1969, pp. 380-385.
38High capacity synchronous generator having no tooth stator; V.S. Kildishev et al; No. 1, 1977 pp. 11-16.
39High Speed Synchronous Motors Adjustable Speed Drives; ASEA Generation Pamphlet OG 135-101 E, Jan. 1985, pp. 1-4.
40High Voltage Cables in a New Class of Generators Powerformer; M. Leijon et al; Jun. 14, 1999; pp. 1-8.
41High Voltage Engineering; N.S. Naidu; High Voltage Engineering ,second edition 1995 ISBN 0-07-462286-2, Chapter 5, pp. 91-98.
42High Voltage Generators; G. Beschastnov et al; 1977; vol. 48. No. 6 pp. 1-7.
43High-Voltage Stator Winding Development; D. Albright et al; Proj. Report EL339, Project 1716, Apr. 1984.
44Hochspannungsaniagen for Wechselstrom; 97. Hochspannungsaufgaben an Generatoren und Motoren; Roth et al; 1938; pp. 452-455.
45Hochspannungsanlagen for Wechselstrom; 97. Hochspannungsaufgaben an Generatoren und Motoren; Roth et al; Spring 1959, pp. 30-33.
46Hochspannungstechnik; A. Küchler; Hochspannungstechnik, VDI Verlag 1996, pp. 365-366, ISBN 3-18-401530-0 or 3-540-62070-2.
47Hydroalternators of 110 to 220 kV Elektrotechn. Obz., vol. 64, No. 3, pp. I32-136 Mar. 1975; A. Abramov.
48Industrial High Voltage; F.H. Kreuger; Industrial High Voltage 1991 vol. I, pp. 113-117.
49In-Service Performance of HVDC Converter transformers and oil-cooled smoothing reactors; G.L. Desilets et al; Electra No. 155, Aug. 1994, pp. 7-29.
50Insulation systems for superconducting transmission cables; O.Toennesen; Nordic Insulation Symposium, Bergen, 1996, pp. 425-432.
51International Electrotechnical Vocabulary, Chapter 551 Power Electronics;unknown author; International Electrotechnical Vocabulary Chapter 551: Power Electronics Bureau Central de la Commission Electrotechnique Internationale, Geneve; 1982, pp. 1-65.
52Investigation and Use of Asynchronized Machines in Power Systems*; N.I.Blotskii et al; Elektrichestvo, No. 12, 1-6, 1985, pp. 90-99.
53J&P Transformer Book 11th Edition;A. C. Franklin et al; owned by Butterworth-Heinemann Ltd, Oxford Printed by Hartnolls Ltd in Great Britain 1983, pp. 29-67.
54J&P Transformer Book 11th Edition;A. C. Franklin et al; owned by Butterworth—Heinemann Ltd, Oxford Printed by Hartnolls Ltd in Great Britain 1983, pp. 29-67.
55Lexikon der Technik; Luger; Band 2, Grundlagen der Elektrotechnik und Kerntechnik, 1960, p. 395.
56Low core loss rotating flux transformer; R. F. Krause, et al; American Institute Physics J.Appl.Phys vol. 64 #10 Nov. 1988, pp. 5376-5378.
57Low-intensy laser-triggering of rail-gaps with magnesium-aerosol switching-gases; W. Frey; 11th International Pulse Power Conference, 1997, Baltimore, USA Digest of Technical Papers, pp. 322-327.
58Manufacture and Testing of Roebel bars; P. Marti et al; 1960, Pub.86, vol. 8, pp. 25-31.
59MPTC: An economical alternative to universal power flow controllers;N. Mohan; EPE 1997, Trondheim, pp. 3.1027-3.1030.
60Neue Lbsungswege zum Entwurf grosser Turbogeneratoren bis 2GVA, 60kV; G. Aicholzer; Sep. 1974, pp. 249-255.
61Neue Wege zum Bau zweipoliger Turbogeneratoren bis 2 GVA, 60kV Elektrotechnik und Maschinenbau Wien Janner 1972, Heft 1, Seite 1-11; G. Aichholzer.
62Ohne Tranformator direkt ins Netz; Owman et al, ABB, AB; Feb. 8, 1999; pp. 48-51.
63Oil Water cooled 300 MW turbine generator;L.P. Gnedin et al;Elektrotechnika, 1970, pp. 6-8.
64Optimizing designs of water-resistant magnet wire; V. Kuzenev et al; Elektrotekhnika, vol. 59, No. 12, pp. 35-40, 1988.
65Our flexible friend article; M. Judge; New Scientist, May 10, 1997, pp. 44-48.
66Performance Characteristics of a Wide Range Induction Type Frequency Converter; G.A. Ghoneem; Ieema Journal, Sep. 1995, pp. 21-34.
67Permanent Magnet Machines; K. Binns; 1987; pp. 9-1 through 9-26.
68Power Electronics and Variable Frequency Drives; B. Bimal; IEEE industrial Electronics-Technology and Applications, 1996, p. 356.
69Power Electronics and Variable Frequency Drives; B. Bimal; IEEE industrial Electronics—Technology and Applications, 1996, p. 356.
70Power Electronics-in Theory and Practice; K. Thorborg; ISBN 0-86238-341-2, 1993, pp. 1-13.
71Power Electronics—in Theory and Practice; K. Thorborg; ISBN 0-86238-341-2, 1993, pp. 1-13.
72Power System Stability and Control; P. Kundur, 1994; pp. 23-25;p. 767.
73Power Transmission by Direct Current;E. Uhlmann;ISBN 3-540-07122-9 Springer-Verlag, Berlin/Heidelberg/New York; 1975, pp. 327-328.
74Powerformer(TM) : A giant step in power plant engineering; Owman et al; CIGRE 1998, Paper 11:1.1.
75Powerformer™ : A giant step in power plant engineering; Owman et al; CIGRE 1998, Paper 11:1.1.
76Problems in design of the 110-5OokV high-voltage genertors; Nikiti et al; World Electrotechnical Congress; 6/21-27/77; Section 1. Paper #18.
77Properties of High Plymer Cement Mortar; M. Tamai et al; Science & Technology in Japan, No. 63 ; 1977, pp. 6-14.
78Quench Protection and Stagnant Normal Zones in a Large Cryostable SMES; Y. Lvovsky et al; IEEE Applied Superconductivity, vol. 7, No. 2, Jun. 1997, pp. 857-860.
79Reactive Power Compensation; T. Petersson; 1993; pp. 1-23.
80Regulating transformers in power systems-new concepts and applications; E. Wirth et al; ABB Review Apr. 1997, pp. 12-20.
81Relocatable static var compensators help control unbundled power flows; R. C. Knight et al; Transmission & Distribution, Dec. 1996, pp. 49-54.
82Shipboard Electrical Insulation; G. L. Moses, 1951, pp. 2&3.
83Six phase Synchronous Machine with AC and DC Stator Connections, Part 1: Equivalent circuit representation and Steady-State Analysis; R. Schiferl et al; Aug. 1983; pp. 2685-2693.
84Six phase Synchronous Machine with AC and DC Stator Connections, Part II:Harmonic Studies and a proposed Uninterruptible Power Supply Scheme; R. Schiferl et al.;Aug. 1983 pp. 2694-2701.
85SMC Powders Open New Magnetic Applications; M. Persson (Editor); SMC Update ,vol. 1, No. 1, Apr. 1997.
86Stopfbachslose Umwalzpumpen- ein wichtiges Element im modernen Kraftwerkbau; H. Holz, KSB 1, pp. 13-19, 1960.
87Submersible Motors and Wet-Rotor Motors for Centrifugal Pumps Submerged in the Fluid Handled; K.. Bienick, KSB; Feb. 25, 1988; pp. 9-17.
88Synchronous machines with single or double 3-phase star-connected winding fed by 12-pulse load commutated inverter. Simulation of operational behaviour; C. Ivarson et al; ICEM 1994, International Conference on electrical machines, vol. 1, pp. 267-272.
89Technik und Anwendung moderner Tauchpumpen; A. Heumann; 1987.
90The Skagerrak transmission-the world's longest HVDC submarine cable link; L. Haglof et al of ASEA; ASEA Journal vol. 53, No. 1-2, 1980, pp. 3-12.
91The Skagerrak transmission—the world's longest HVDC submarine cable link; L. Haglof et al of ASEA; ASEA Journal vol. 53, No. 1-2, 1980, pp. 3-12.
92Thin Type DC/DC Converter using a coreless wire transformer; K. Onda et al; Proc. IEEE Power Electronics Spec. Conf.; Jun. 1994, pp. 330-334.
93Toroidal winding geometry for high voltage superconducting alternators; J. Kirtley et al; MIT-Elec. Power Sys. Engrg. Lab for IEEE PES;Feb. 1974.
94Toroidal winding geometry for high voltage superconducting alternators; J. Kirtley et al; MIT—Elec. Power Sys. Engrg. Lab for IEEE PES;Feb. 1974.
95Tranforming transformers; S. Mehta et al; IEEE Spectrum, Jul. 1997, pp. 43-49.
96Transformateurs a courant continu haute tension-examen des specifications; A. Lindroth et al; Electra No. 141, Apr. 1992, pp. 34-39.
97Transformer core losses; B. Richardson; Proc. IEEE May 1986, pp. 365-368.
98Transformerboard; H.P. Moser et al; 1979, pp. 1-19.
99Underground Transmission Systems Reference Book; 1992;pp. 16-19; pp. 36-45; pp. 67-81.
100Variable-speed switched reluctance motors; P.J. Lawrenson et al; IEE proc, vol. 127, Pt.B, No. 4, Jul. 1980, pp. 253-265.
101Verification of Limiter Perormance in Modern Excitation Control Systems; G. K. Girgis et al; IEEE Energy Conservation, vol. 10, No. 3, Sep. 1995, pp. 538-542.
102Weatherability of Polymer-Modified Mortars after Ten-Year Outdoor Exposure in Koriyama and Sapporo; Y. Ohama et al; Science & Technology in Japan No. 63; 1977, pp. 26-31.
103Zur Entwicklung der Tauchpumpenmotoren; A. Schanz; KSB, pp. 19-24.
104Zur Geschichte der Brown Boveri-Synchron-Maschinen; Vierzig Jahre Generatorbau; Jan.-Feb. 1931 pp. 15-39.
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Classifications
U.S. Classification318/438, 361/47, 361/48, 318/148, 174/DIG.15, 307/149
International ClassificationH02H7/06, H02K3/40, H02H9/02, H02K17/28, H01B7/02, H02J3/18
Cooperative ClassificationY10S174/15, Y02E40/30, H02J3/1807, H02K2203/15
European ClassificationH02J3/18B
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Dec 12, 2006FPExpired due to failure to pay maintenance fee
Effective date: 20061015